Portable power bank



FIG. 1 is a top view of a portable power bank showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a top, rear, left side perspective view thereof; and,

FIG. 8 is a top, front, right side perspective view thereof.

In the drawings, the evenly spaced broken lines represent portions ofthe article which form no part of the claimed design. The dot-dash linesrepresent a boundary to the claimed design and form no part thereof.

CLAIM The ornamental design for a portable power bank, as shown anddescribed.